Malicious PDF — malware analysis report

Static analysis result for SHA-256 699a74b0b3a537a3…

MALICIOUS

PDF

80.1 KB Created: 2021-04-21 12:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b41e24a8971365266826b1d0b0dba2dd SHA-1: 5533fdfc189a6213c754a9640936874d7e791027 SHA-256: 699a74b0b3a537a3c25df1db63f2da9303a72b2d3de0479264b2a43a775c2fb7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document employs a social engineering tactic, presenting a lure to download Python, which is a common pretext for users to install malicious browser extensions or updates. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL `https://xajibur.ru/strik?utm_term=download+python+3.8+for+windows+10+64+bit+free` likely serves as a download or redirection point for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/strik?utm_term=download+python+3.8+for+windows+10+64+bit+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449968/normal_5fc854426d080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464053/normal_5fee9a0c14dbe.pdfIn PDF document text
    • http://aycotoro6.xyz/best_book_to_understand_mathematical_logicjtcd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378607/normal_606d3c73f0f63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376359/normal_5fdfa026ab190.pdfIn PDF document text
    • https://varepanuror.weebly.com/uploads/1/3/5/3/135394497/7826656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_6059a20294565.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/tuzujevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_6053646c4cfd9.pdfIn PDF document text
    • http://alesyasemiletova.com/icd_10_for_fatigue_in_pregnancyikzaq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_604febd765625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467936/normal_602e61458db96.pdfIn PDF document text
    • http://cosmicgig.com/word_cookies_cheats_daily_puzzle_2020g7l3x.pdfIn PDF document text
    • http://presentinsta.online/gogusamhfb26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_604468b9023d3.pdfIn PDF document text
    • http://mon-compte-cmb.best/mazda_android_auto_retrofit_usat9xh1.pdfIn PDF document text
    • https://gakuwalexutibok.weebly.com/uploads/1/3/4/3/134332976/milatafawipadi_semubekofaxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://toridefe.rf.gd/wabozufibosedofurowad.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/reduwuranozutu.pdfIn PDF document text
    • http://mitefunigesito.rf.gd/fogipuf.pdfIn PDF document text
    • http://dolumuvi.rf.gd/77696158687.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/navy_blue_jacket_manual.pdfIn PDF document text
    • http://jalafugidovi.epizy.com/14307973485.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 6076 bytes
SHA-256: 31ec6221441f601ad0fe308aff0ae9549df6f448c261500465590e33cb189d08
font_01_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 10912 bytes
SHA-256: 0018f61cb13231878bbcd9ddd8655bafa0332fbd9b5660a48d9d14ada4cdb313
font_02_sfnt_off0001247d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378